If d₁ is the depth of cutting, d₂ is the height of the bank from bed level r₂ : 1 and r₁ : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

A. x = r₁d₁

B. x = r₂d₂

C. $${\text{x}} = \frac{{{{\text{d}}_1}}}{{{{\text{r}}_1}}}$$

D. $${\text{x}} = \frac{{{{\text{d}}_2}}}{{{{\text{r}}_2}}}$$

Answer: Option B